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<head>
  <meta charset="utf-8">
  <title>测试排列组合算法</title>
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<body>
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document.write("<h1>测试组合算法</h1>")
combin(["+", "-", "*", "/"], 3, showResult);
document.write("<h1>测试排列算法</h1>")
perm(["A", "B", "C", "D"], 4, showResult)
</script>

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